As a result of his insurance business, he was convicted of forgery in 1934 and was sentenced to one to three years in state prison.

[2] At the time of his first term in office in 1915, MacMillin was the youngest person to ever serve as an Arizona State Senator, being 26.

[4] With the U. S. entrance into World War I, MacMillin joined the army and was a sergeant in the 89th Field Artillery.

First, he faced a liquor charge on avoiding Internal Revenue Service taxes.

[14] In June he was indicted on forgery charges claiming that he forged the name of the secretary of the highway department on a lost policy form.

[15] As his trial began in July, just after the jury was selected, MacMillin pleaded guilty to the charge.